How to change value of a field in hook_node_view

Question

In hook_node_view() I want to rewrite some fields' values. The $node parameter is not referenced, so how can I rewrite a value?

Answer 1

Take a look at the API documentation for hook_node_view, specifically the comments at the end of the page -> Has anyone been able to successfully modify a node object?. There's talk of using hook_node_load as a solution as well as many of the hooks that are field specific. Note the comments at the bottom of the hook_node_load API page that explains why $nodes is not called by reference but is still changed when changes are made to the variable within the hook re: OOP -> http://php.net/manual/en/language.oop5.references.php.

Answer 2

Clear the cache or visit the Modules page to get the hook picked up after you've added it to your module. Then something like this will work.

function my_module_node_view($node, $view_mode, $langcode) {  
  switch($node->type) {
    case 'foo':
      $node->content['field_my_field'][0]['#markup'] = 'Changed!';  
    break;  
  }
}

Answer 3

You can do that by implementing template_preprocess_field(&$variables, $hook) in your template.php

function THEMENAME_preprocess_field(&$variables, $hook) {
  if ($node = menu_get_object()) {
    if ($node->type == 'car') {
      if($variables['element']['#field_name'] == 'field_price') {
        $variables['items']['0']['#markup'] = $new_value; //new value;
      }
    }
  }
}

Check here: http://tassaf.moriamedia.com/change-field-value-in-node-view/